20917151711 has 2 divisors, whose sum is σ = 20917151712. Its totient is φ = 20917151710.

The previous prime is 20917151701. The next prime is 20917151719. The reversal of 20917151711 is 11715171902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20917151711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20917151719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10458575855 + 10458575856.

It is an arithmetic number, because the mean of its divisors is an integer number (10458575856).

Almost surely, 2^20917151711 is an apocalyptic number.

20917151711 is a deficient number, since it is larger than the sum of its proper divisors (1).

20917151711 is an equidigital number, since it uses as much as digits as its factorization.

20917151711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 35.

The spelling of 20917151711 in words is "twenty billion, nine hundred seventeen million, one hundred fifty-one thousand, seven hundred eleven".